equals

The result is true if and only if the argument is not
null and is a DateValue object that
represents the same value as this object.

The value comparison is performed using the ISO 8601 string
representation of the dates, since the native Calendar.equals()
method may produce false negatives (see JSR-598).

Note that the comparison still returns false when comparing the
same time in different time zones, but that seems to be the intent
of JSR 170. Compare the Value.getDate().getTime() values if you need
an exact time comparison in UTC.